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create web page form create web page form to_s » "Song: Bicylops--Fleck (260)" Excellent, we're making progress. However, we've slipped in something subtle. We said that Ruby supports to_s for all objects, but we didn't say how. The answer has to do with inheritance, subclassing, and how Ruby determines what method to run when you send a message to an object. This is a subject for a new section, so.

create web page form ... Inheritance and Messages Inheritance allows you to create a class that is a refinement or specialization of another class. For example, our jukebox has the concept of songs, which we encapsulate in class Song.

create web page form Then marketing comes along and tells us that we need to provide karaoke support. A karaoke song is just like any other (there's no vocal on it, but that doesn't concern us). However, it also has an associated set of lyrics, along with timing information. When our jukebox plays a karaoke song, the lyrics should flow across the screen on the front of the jukebox in time with the music. An approach to this problem is to define a new class, KaraokeSong, which is just like Song, but with a lyric track.

create web page form class KaraokeSong < Song def initialize(name, artist, duration, lyrics) super(name, artist, duration) @lyrics = lyrics end end The ``< Song'' on the class definition line tells Ruby that a KaraokeSong is a subclass of Song. (Not surprisingly, this means that Song is a superclass of KaraokeSong. People also talk about parent-child relationships, so KaraokeSong's parent would be Song.) For now, don't worry too much about theinitialize method; we'll talk about that super call later. Let's create a KaraokeSong and check that our code worked.

create web page form

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create web page form